Insulator



Dec. 7 192s. I 1,610,085

W. T. GODDARD INSULA'TOR Filed Nov. 29, 1922 2 Sheets-Sheet 1 Dec. 7 1926. 1,610,085

w. 'r. GODDARD INSULATOR Filed Nov. 29, 1922 2 Sheets-Sheet 2 Patented Dec. 7, 1926 UNITED STATES "PATENT OFFICE.

VIALTER T. GODDARD, O'F HAMILTON, ONTARIO, CANADA, ASSIGNOR TO LOGKE INSULA- TOR CORPORATION, OF BALTIMORE, MARYLAND, A CORPORATION OF MARYLAND.

INSULATOR.

Application filed November 29, 1922. Serial No. 604,071.

The invention relates to insulators and more particularly ,to insulators wherein a number of insulating units are connected in nested relation to form an insulator.

The invention consists in the construction hereinafter more specifically pointed out and in the method used to connect the various sections or units.

The principal object of the invention, generally stated, is to provide the insulating units with means for rigidly connecting each unit to the adjacent cement and at the same time to provide adequate means to prevent damage to the assembled units by thermal changes to which the insulators are subjected or by the subsequent hydration of the cementing compound.

Another object of the invention is to provide adjacent nested insulator units with alternately arrangedyielding and roughened surfaces and to arrange the surfaces on adjacent units in staggered or offset relation to thereby form a firm bond between sections without detriment to the required resilience between the parts.

Various other objects of the invention will be hereinafter made clear from the detailed description thereof when taken in connection with the accompanying drawings wherein several modes of accomplishing the invention have been illustrated.

Referring now to the drawings:

Figure 1 is a sectional view in side elevation of a multiple unit insulator showing one form of my invention.

Figure 2 is a view corresponding to Figure 1 illustrating a slightly modified form.

Figure 3 is a central vertical sectional view showing in detail the construction illustrated in Figure 2.

Figure 4 is abottom plan view of the cen tral portion of Figure 3.

Figure 5 is a transverse sectional view taken on line '5-5 of Figure 2.

Figure 6 is an enlarged fragmentary section of the form shown in Figure 1.

Figure 7 is a view corresponding to Figure 5 illustrating another modified form.

Throughout the various figures corresponding parts are designated by like reference characters.

For convenience I have illustrated a three unit insulator although it is to be understood that the invention is in no wise limited to this number of units but may be advantageously employed with a greater or less number of units or with other forms of insulators, as desired. The insulator 1 comprises a plurality of nested sections 2, 3 and 4:, the section 2 forming the cap and provided with the usual line wire groove 5 and the tie wire groove 6. On its underside it is provided with a centrally disposed cavity or recess 7 for the reception of the head 8 of the section and likewise the section 3 is provided with a cavity 9 for thereception of the head 10 of the. section 4. Vithin the section t is provided the screw-threaded recess 11 for the insulator supporting pin, not shown. It is the common practice, in order to connect the units, to fill or partially [ill the cavities 7 and 9 of the respective units 2 and 3 with a cementitious compound and to then invert these units over the adjoining unit so as to fill all the spaces between the units with cement. Since the connected surfaces of the units are generally glazed it is often difficult to form a bond between the ocment and the adjacent surface and in order to form this bond it has been common practice to either roughcn the adjacent portions of these surfaces by means of a tool or to apply to the glaze, before the same has been fired or hardened, sand generally formed by granulating fired porcelain, the sand adhering to the glaze and being firmly united to the surface upon the firing of the insulator. The roughened surface formed by either of these methods has proved very efficient in forming a tenacious bond between the sections and the cement compound. There remains a difficulty which has not been overcome by the use of roughened surfaces, which difficulty is in the thermal changes to which the insulator units are subjected in service,

which sometimes resuits in the destruction of one or more of the units upon the sudden contraction of the same owing to the incompressible nature of the cement interposed between the units. This diiticulty has also been part ally overcome by applying a yielding coating to the roughened surfaces, thereby forming in effect an expansion joint between the insulator and the adj accnt cement. It will be obvious to those skilled in the art that the application of a yielding compound to a roughened or sanded surface is one that requires a high degree of skill since if this thermal changes without detriment to this bond.

Referring now to Figure 1, there is applied to the sections 2, 3 and 4 a ring, band or strip of sand or this ring, band or strip 1 ay be formed by roughening the surface of the unit. These strips are designated as 12 and 13, the strips 12 being on the heads of the units 3 and 4;, respectively, while the strips 13 are on the walls of the cavities 7 and 9 of the units 2 and 3. In this particular embodiment of the invention, these strips eX- tend circumferentially around the portions of the units to which they are applied. It will be observed that the strip or band 12 has its upper marginal edge offset or spaced from the lower marginal edge of the strip or band 13. In other words, these bands are arranged in staggered relation. At the lower marginal edge of the bands 12 there is applied to the respective units a coating of elastic or yielding material and likewise from the upper marginal edgethere is also provided an elastic or yielding coating, the said coatings being designated by the reference numeral 14. That is to say, on the neck or head of each unit there is provided an elastic coating which coating is interrupted by a band having a roughened surface. There is also applied to the units and from the lower marginal edge of the bands 13 a corresponding yielding coating 14 and this coating may be applied to the upper portions of the respective units if desired.

It will be observed from Figure 1 that the roughened surface on one unit is spaced from the roughened surface on the other adjacent unit, and this also applies to the coatings of elastic Oryielding material, the spacing in this example being vertical. There is provided opposite each roughened surface or portion a yielding portion on the adjacent unit.

Instead of arranging the alternate bands of coated and roughened surfaces horizontally, these bands may be arranged vertically, as shown in Figures 2 to 5, inclusive. In this construction the cavities within the units 2 and 3 are provided with vertically arranged bands or strips of roughened surfaces 18 and interposed between these bands or strips is the yielding or elastic coating 14, while on the stems or heads 8 and 10 of the respective units there are provided corresponding strips of roughened surface 12 and interposed between these strips is the yielding or elastic coating 14. When the insulating units are assembled they are positioned so that the strips 12 of the units 3 and t lie intermediate the strips 13 formed within the cavities of the units 2 and 8. It will be observed in this modification also that the roughened surface on one unit lies opposite the yielding coating on the adjacent unit to con'ipensate for thermal changes and there is maintained nevertheless a firm bond between the units.

In Figure 7 the strips of roughened surface 12 and 13 are arranged spirally of the respective portions of the connected surfaces. Except for this change the construction is identical with that heretofore described and need not be further mentioned.

It will be noted that in all the forms of my device I have provided for a firm bond between the adjacent insulator sections by forming on each a sanded or roughened surface without any yielding coating thereon. The roughened surfaces are also so arranged that when the units are assembled the roughened surface on one unit lies opposite the yielding coating on the opposite unit, thus providing for thermal changes in the units without detriment to the same or to the bond between the units and the cement.

I claim:

1. An insulator comprising a plurality of connected units, the connected surfaces of said units being provided with spaced strips of yielding material, said strips being arranged in staggered relation, and means for connecting said units.

2. An insulator comprising a plurality of connected units, the connected surfaces of said units each being furnished with a roughened strip or portion, said strips or portions being arranged in staggered relation, and means for connecting said units.

3. An'insulator comprising a plurality of connected units, the connected surfaces of said units each having spaced interrupted strips of yielding material thereon, each strip being offset with respect to a corresponding strip on another unit, and cementitious means for connecting said units.

4. An insulator comprising a plurality of connected units, the connected surfaces of said units each being furnished with strips of yielding material interposed between roughened portions, the roughened portion on one surface being arranged opposite to a yielding strip on the surface of the adjacent unit, and cementit-ious means for connecting said units.

5. An insulator comprising a plurality of connected units, the connected surfaces of said units each being furnished with a strip having a sanded surface, the sanded surfaces being arranged in staggered relation, and means for connecting said units.

6. An insulator comprising a plurality of connected units, the connected surfaces of said units each being furnished with strips of yielding material having interposed be tween each adjacent pair a strip having a sanded surface, the sanded surface strips being arranged in staggered relation to each otheia and cen'ientitious means for connecting said units.

7. Jin insulator comprising a plurality of connected units, the connected surfaces of said units being glazed sanded material ap pli d to the said glaze to form a plurality of spaced strips each of which is provided with a roughened surface, a yielding coating applied to said suri'aces between 5; id ronghened strips, and ceinentitious means for connecting said units.

, 8. An insulator comprising a plurality of units with complementary surfaces, said surfaces havingstrips 01 roughened naterial thereon, each strip being arranged in oilset relation "with respect to a corresponding strip on the cooperating unit, and cen'ientitions material between said units for connecting the same.

In testimony whereof I affix my signature.

mimics a. eonnann. 

